Irish authorities are liaising with Polish officials over the source of the contamination.
Traces were found at Rangeland Foods in Co Monaghan, owned by ABP Food Group.
The Group has lost contracts with:
- Co-Operative Group
- Burger King
More top news
Barack Obama and his wife Michelle have exchanged Valentine's Day messages on the The Ellen DeGeneres Show.
Republican presidential candidates have taken part in a fiery debate as they clashed over foreign policy and immigration.
The £15 'liquid biopsy' looks for fragments of genetic material in a tiny drop of saliva.